Multiple Choice
According to the kinetic-molecular theory, what is the primary cause of the pressure exerted by a gas in a container?
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7. Gases
Kinetic Molecular Theory
Multiple Choice
Which of the following is NOT an assumption of the kinetic molecular theory of gases?
A
Gas particles experience attractive and repulsive forces between each other.
B
Collisions between gas particles are perfectly elastic.
C
Gas particles have negligible volume compared to the container.
D
The average kinetic energy of gas particles is proportional to the temperature in kelvins.
Verified step by step guidance1
Recall that the kinetic molecular theory (KMT) of gases is based on several key assumptions that describe the behavior of ideal gases.
List the main assumptions of KMT: (1) Gas particles are in constant, random motion; (2) Gas particles have negligible volume compared to the container; (3) Collisions between gas particles and with the container walls are perfectly elastic, meaning no energy is lost; (4) There are no attractive or repulsive forces between gas particles; (5) The average kinetic energy of gas particles is directly proportional to the absolute temperature (in kelvins).
Analyze each given statement in the problem and compare it to the assumptions of KMT.
Identify that the statement 'Gas particles experience attractive and repulsive forces between each other' contradicts the KMT assumption that there are no intermolecular forces between gas particles.
Conclude that the statement about gas particles experiencing attractive and repulsive forces is NOT an assumption of the kinetic molecular theory of gases.
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